Wedge bolt (e.g. - Bushnell & Cannondale)
Pinch bolt
Set screw
Wedge bolt designs use a seamless EBB shell and an expanding wedge bolt design. The concept is similar to that of a quill stem, in that tightening a bolt expands the eccentric within the EBB shell. While the design works very well, some types of wedge bolt eccentrics can binds in the shell, requiring a rubber or wooden mallet to loosen the eccentric once the bolt(s) have been loosened. NOTE: Bushnell EBBs are designed with a self-unlocking mechanism.
Pinch bolt designs use a slotted EBB shell with external bolts that pinch the EBB shell around the eccentric. This simple design works very well. The open EBB shell is exposed to more contamination, though, and may require more frequent greasing than the other two designs.
Set screw designs use a seamless EBB shell with external set screws that thread directly into the EBB shell and rest tightly against the eccentric itself. The only minor drawback to this design is that the set screws may "divot" the eccentric somewhat. This may eventually lead to "sweet spots" that cause the eccentric to locate to certain positions within the EBB shell.
All three designs are well-proven, and should provide a relatively maintenance-free means to tension your single speed's chain. There may, however, be differences in the amount of "throw" provided by the different eccentric designs, which could potentially limit chain tensioning effectiveness when using certain gear combinations. Consult a reputable framebuilder to confirm compatibility between that framebuilder's preferred EBB design and your intended gearing.
skYde a écrit:le systeme Cannon' a l air vraiment bien!
C ce que je voulais faire.
primus a écrit:moi j'aime les photos, il manque les clamp....
ça ressemble à quoi ? un boitier BMX -> vtt usiné décentré ?
Singlespeed maniac a écrit:primus a écrit:attends bouge pas maintenant je colle les zimages
Ah, tu veux dire les posters...
Singlespeed maniac a écrit:primus a écrit:le bushnell ça doit marche super !
Ca doit quand même nécessiter une entretien régulier pour pas rester coincé.
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